Oiling machine cheating checking method and device

Abstract

The invention discloses a method and a device for checking cheating of an oiling machine. The method comprises the following steps: receiving a serial number pairing relationship between an encoder of the oiling machine and a monitoring microprocessor; according to the serial number matching relationship, generating a false serial number different from the standard serial number of the monitoring microprocessor and sending the false serial number to the encoder; and under the condition that the refueling machine refuels for a specific number of times but is still not locked, determining that cheating exists in the refueling machine. Whether the self-locking function of the oiling machine is broken or not is tested by means of the false serial number generated on purpose, so that the cheating behavior of the oiling machine can be quickly, effectively and conveniently checked.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and more particularly to a method and device for detecting cheating in a fuel dispenser. Background Art

[0002] With the development of automobile transportation, fuel dispensers (hereinafter referred to as dispensers) have also developed rapidly. Currently, dispensers usually use computer technology and are controlled by computers to make refueling convenient, fast and accurate.

[0003] Figure 1 This is a schematic diagram of the working principle of a fuel dispenser according to the relevant technology. Figure 1 As shown in the figure, the control board sends a control signal to drive the motor, which then drives the oil pump to deliver the fuel to the car's fuel tank through the oil-gas separator, control valve, flow measurement converter and oil gun. Figure 1 As can be seen, during refueling, the fuel pushes the flow measurement transducer, which in turn rotates the encoder spindle. The encoder converts the mechanical rotation of the flow measurement transducer into a pulse or digital signal, which is then transmitted to the control board. The control board processes the received signal to obtain the fuel volume and payment amount, which are then transmitted to the display device.

[0004] However, despite the high degree of automation and electronicization of gas pumps, cheating still exists. The cheating methods have evolved from the initial mechanical cheating methods such as replacing the bevel gear of the mechanical counter, adding a bypass, adjusting the oil pressure, etc. to high-tech cheating methods such as remote control technology and tampering with software. Now it has developed into counterfeit anti-cheating systems, self-locking function systems, direct cheating, etc., adding pulse signals or modifying the gas pump pulse equivalent to achieve metering cheating of short weight, and deceiving the monitoring microprocessor to undercount or not include the total accumulation to achieve tax evasion (hereinafter referred to as metering cheating, tax cheating, and collectively referred to as gas pump software cheating). These cheating phenomena directly affect the accuracy of gas pumps, infringe on the legitimate rights and interests of consumers, cause damage to the market economic order, and more seriously, cause a large loss of national tax revenue.

[0005] Software cheating is highly concealed, highly specialized, quickly recovers, and difficult to detect. This makes it difficult for law enforcement and inspection personnel to quickly and accurately identify and detect software cheating. Currently, inspection methods rely solely on cracking the cheating program to accurately determine the presence of cheating, but this method requires law enforcement personnel to possess proficient computer software skills and is highly specialized. Furthermore, even if anomalies are discovered through inspection of the dispenser's components and cables, the only options available are to dismantle the dispenser's motherboard and send it (1) to the dispenser manufacturer to verify whether the metering program has been illegally modified; or (2) to the manufacturer of the self-locking system to verify whether the monitoring microprocessor has been illegally altered. These inspections have drawbacks: (1) the manufacturer's conclusion is often, "This motherboard (or monitoring microprocessor) is not our product" or "It is inconsistent with the factory state," failing to accurately determine the presence of cheating; (2) the manufacturer lacks relevant certification (such as CMA accreditation), and its inspection report cannot serve as the basis for administrative penalties; and (3) the inspection of such questionable dispensers currently takes approximately one week, during which time the dispenser is taken out of service. Finally, if it is identified as an original product, there is also the risk of the gas station operator demanding compensation.

[0006] Therefore, the current situation urgently requires a device and method for quickly checking whether there is cheating in fuel dispensers. In particular, there are more than 40 fuel dispenser manufacturers in my country, with thousands of fuel dispenser models. The internal structures of different fuel dispenser models vary greatly, so an inspection device suitable for different fuel dispenser models has become an urgent need. Summary of the Invention

[0007] The present invention aims to provide a connector-type tester and a method for detecting cheating in a fuel dispenser, which can detect cheating behavior in a fuel dispenser quickly, effectively and conveniently.

[0008] According to one aspect of the present invention, a method for checking cheating in a fuel dispenser is provided, comprising: receiving a serial number pairing relationship between an encoder and a monitoring microprocessor of the fuel dispenser; generating a false serial number different from a standard serial number of the monitoring microprocessor based on the serial number matching relationship and sending the false serial number to the encoder; and determining that the fuel dispenser is cheating if the fuel dispenser performs refueling a specific number of times but still does not lock the machine.

[0009] Preferably, after the fuel dispenser is locked, the method further comprises: sending the standard serial number to the encoder to unlock the fuel dispenser.

[0010] Preferably, after sending the false serial number to the encoder, the method further includes: generating a new pulse signal according to a set ratio based on the standard pulse signal sent by the encoder and sending it to the metering and control mainboard of the gas station to simulate metering cheating; and determining that the gas station has cheated when the gas station performs a specific number of refueling operations for simulating metering cheating (usually five times) but still does not lock the machine.

[0011] Preferably, after sending the new pulse signal to the metering and control mainboard, the method further includes: determining that the gas station has cheated when the gas station performs a specific number of refueling operations for simulating metering cheating but there is no corresponding abnormal refueling record.

[0012] Preferably, the false serial number has the same total number of digits as the standard serial number, and both contain the same fuel dispenser manufacturer code, fuel dispenser model code, fuel dispenser serial number code and random code.

[0013] Preferably, the false serial number S 虚假 The generation method is:

[0014] S 虚假 =f(M 标准 )·g(T 标准 )·h(N 标准 )·k(R 标准 )

[0015] in: M is the manufacturer code of the fuel dispenser, T is the model code of the fuel dispenser, N is the serial number code of the fuel dispenser, and R is a random code; f(M 标准 )=M 标准 ⊕K, K is the preset key, ⊕ represents the XOR operation; g(T 标准 )=(T 标准 +Δ T )mod10L T , ΔT is the fixed offset, L T is the number of digits in the model code; h(N 标准 )=(N 标准 ×P)mod10L N , P is a prime number, L N The number of digits of the serial number code; k(R 标准 )=H(R 标准 ||Salt), H is the hash function, Salt is the random salt value;

[0016] The check code C of the false serial number and the standard serial number satisfies: C 虚假 =CRC(S 虚假 \R 虚假 ) CRC is a cyclic redundancy check algorithm to ensure the format integrity of the fake serial number; the backslash indicates that the check code C 虚假 When calculating the false serial number S, it is necessary to exclude 虚假 Random code R in 虚假 .

[0017] According to another aspect of the present invention, a device for checking cheating in a fuel dispenser is also provided, comprising: a first connector for connecting to an encoder of the fuel dispenser, for receiving from the encoder a serial number pairing relationship between the encoder and a monitoring microprocessor; a tester connected to the first connector, for generating a false serial number that is different from a standard serial number of the monitoring microprocessor based on the serial number matching relationship; and the first connector is also used to send the false serial number to the encoder; the tester is also used to determine that the fuel dispenser is cheating when the fuel dispenser has refueled a specific number of times but is still not locked.

[0018] Preferably, the first connector also sends the standard serial number to the encoder to unlock the fuel dispenser.

[0019] Preferably, the device also includes: a second connector for connecting to the metering and control main board of the gas station; the first connector is also used to receive the standard pulse signal sent by the encoder; the tester is also used to generate a new pulse signal according to a set ratio based on the standard pulse signal and send it to the metering and control main board through the second connector; the tester is also used to determine whether the gas station is cheating when the gas station refuels a specific number of times but still does not lock the machine.

[0020] Preferably, the tester is also used to determine that the fuel dispenser is cheating when the fuel dispenser performs fueling for a specific number of times but there is no corresponding abnormal fueling record.

[0021] In summary, the present invention provides a method and device for detecting fuel dispenser fraud. By intentionally generating a false serial number and sending it to an encoder, if the fuel dispenser does not lock after a specific number of refueling attempts (usually three), the fuel dispenser's self-locking function is considered to be in violation of regulatory requirements. By using this intentionally generated false serial number to test whether the fuel dispenser's self-locking function has been defeated, the present invention can quickly, effectively, and conveniently detect fuel dispenser fraud. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the working principle of a fuel dispenser according to the prior art;

[0024] Figure 2 is a flow chart of a method for detecting cheating in a fuel dispenser according to an embodiment of the present invention;

[0025] Figure 3is a schematic diagram of the working principle of a fuel dispenser according to an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of an operating panel of a tester according to an embodiment of the present invention; and

[0027] Figure 5 4 is a flow chart of a method for detecting cheating in a fuel dispenser according to a specific example of the present invention. DETAILED DESCRIPTION

[0028] The following examples are provided merely to illustrate the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that other variations or modifications may be made based on the following description. These variations, modifications, substitutions, and variations arising from the principles and spirit of the present invention are intended to fall within the scope of the present invention.

[0029] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0030] The invention provides a method for checking cheating in a fuel dispenser. Figure 2 FIG. 1 is a flow chart of a method for checking cheating in a fuel dispenser according to an embodiment of the present invention. Figure 2 As shown, the following steps are included.

[0031] S202: Receive the serial number pairing relationship between the encoder of the fuel dispenser and the monitoring microprocessor.

[0032] S204: Generate a false serial number that is different from the standard serial number of the monitoring microprocessor according to the serial number matching relationship and send it to the encoder.

[0033] S206: If the fuel dispenser does not lock after refueling for a specific number of times, it is determined that the fuel dispenser is cheating.

[0034] In the related art, if law enforcement officers discover anomalies while inspecting a fuel dispenser's components, connecting cables, etc., they are usually forced to remove the dispenser's mainboard and send it for inspection, making it impossible to immediately confirm software cheating. The present invention takes the opposite approach, intentionally generating a false serial number and sending it to the encoder. If the fuel dispenser does not lock after a specific number of refuelings (usually three), the fuel dispenser's self-locking function does not meet regulatory requirements and is therefore cheating. The present invention uses intentionally generated false serial numbers to test whether the fuel dispenser's self-locking function has been disabled, making it possible to quickly, effectively, and conveniently detect fuel dispenser cheating.

[0035] According to one embodiment of the present invention, after the fuel dispenser is locked, the method further includes: sending the standard serial number to the encoder to unlock the fuel dispenser. In this embodiment of the present invention, the fuel dispenser is unlocked as soon as possible after checking that no cheating has occurred, thereby avoiding affecting its normal use.

[0036] Preferably, after sending the false serial number to the encoder, the method further includes: generating a new pulse signal according to a set ratio based on the standard pulse signal sent by the encoder and sending it to the metering and control mainboard of the gas station to simulate metering cheating; and determining that the gas station has cheated when the gas station performs a specific number of refueling operations (usually five times) for simulating metering cheating but still does not lock the machine. Alternatively, when the gas station performs a specific number of refueling operations for simulating metering cheating but there is no corresponding abnormal refueling record, it is determined that the gas station has cheated. The embodiment of the present invention provides two ways to determine cheating. These two methods are relatively common in current gas station cheating, and the inspection operation is simple and the inspection results are accurate.

[0037] According to one embodiment of the present invention, the total number of digits of the false serial number is the same as that of the standard serial number, and both contain the same fuel dispenser manufacturer code, fuel dispenser model code, fuel dispenser serial number code and random code.

[0038] According to one embodiment of the present invention, the false serial number S 虚假 The generation method is:

[0039] S 虚假 =f(M 标准 )·g(T 标准 )·h(N 标准 )·k(R 标准 )

[0040] in: M is the fuel dispenser manufacturer code, T is the fuel dispenser model code, N is the fuel dispenser serial number code and R is a random code; f(M 标准 )=M 标准 ⊕K, K is the preset key, ⊕ represents the XOR operation; g(T 标准 )=(T 标准 +Δ T )mod10L T , ΔT is the fixed offset, L T The number of digits encoding the dispenser model; h(N 标准 )=(N 标准 ×P)mod10L N , P is a prime number, L N The number of digits encoding the dispenser serial number; k(R标准 )=H(R 标准 ||Salt), H is the hash function, Salt is the random salt value;

[0041] The check code C of the false serial number and the standard serial number satisfies: C 虚假 =CRC(S 虚假 \R 虚假 ) CRC is a cyclic redundancy check algorithm to ensure the format integrity of the fake serial number; the backslash indicates that the check code C 虚假 When calculating the false serial number S, it is necessary to exclude 虚假 Random code R in 虚假 .

[0042] The present invention also provides a fuel dispenser cheating detection device. Figure 3 This is a schematic diagram of the working principle of a fuel dispenser according to an embodiment of the present invention. Figure 3 and Figure 1 Compared to the previous example, a tester is added between the encoder and the control board. The details are as follows.

[0043] The fuel dispenser cheating detection device includes: a first connector, used to connect to the encoder of the fuel dispenser, used to receive the serial number matching relationship between the encoder and the monitoring microprocessor from the encoder; a tester, connected to the first connector, used to generate a false serial number that is different from the standard serial number of the monitoring microprocessor based on the serial number matching relationship; and the first connector is also used to send the false serial number to the encoder; the tester is also used to determine whether the fuel dispenser is cheating when the fuel dispenser performs a specific number of refueling operations for simulating metering cheating (usually five times) but the machine is still not locked.

[0044] In the related art, if law enforcement officers discover anomalies while inspecting a fuel dispenser's components, connecting cables, etc., they are usually forced to remove the dispenser's mainboard and send it for inspection, making it impossible to immediately confirm software cheating. The present invention takes the opposite approach, intentionally generating a false serial number and sending it to the encoder. If the fuel dispenser does not lock after a specific number of refuelings (usually three), the fuel dispenser's self-locking function does not meet regulatory requirements and is therefore cheating. The present invention uses intentionally generated false serial numbers to test whether the fuel dispenser's self-locking function has been disabled, making it possible to quickly, effectively, and conveniently detect fuel dispenser cheating.

[0045] It should be noted that the first connector in this embodiment is applicable to various types of encoders produced by different self-locking function manufacturers and is also applicable to different brands of fuel dispensers. The first connector can also adopt a plug-in connector design, which can be easily and quickly connected to the encoder.

[0046] It should also be noted that the monitoring microprocessor and encoder in this embodiment, which have a self-locking function for the fuel dispenser, have unique serial numbers. After the self-locking function is activated, the monitoring microprocessor and encoder are automatically bound together. The monitoring microprocessor serial number and the encoder serial number are bound together to form a unique serial number pairing, which is then stored in the encoder.

[0047] According to one embodiment of the present invention, after the fuel dispenser is locked, the first connector also sends the standard serial number to the encoder to unlock the fuel dispenser. This embodiment of the present invention unlocks the fuel dispenser as soon as possible after checking that there is no cheating, thereby avoiding affecting its normal use.

[0048] According to one embodiment of the present invention, the device for detecting cheating in a fuel dispenser further includes: a second connector suitable for connecting to the metering control motherboards of fuel dispensers of different brands. The second connector can be designed as a plug connector, allowing for convenient and quick connection to these metering control motherboards. The first connector is also used to receive the standard pulse signal sent by the encoder; the tester is also used to generate a new pulse signal according to a set ratio based on the standard pulse signal and send it to the metering control motherboard via the second connector to simulate metering cheating; the tester is also used to determine whether the fuel dispenser is cheating if the fuel dispenser performs a specific number of refueling operations (usually five) to simulate metering cheating but the machine does not lock. Furthermore, the tester is also used to determine whether the fuel dispenser is cheating if the fuel dispenser performs a specific number of refueling operations to simulate metering cheating but no corresponding abnormal refueling records exist. The embodiment of the present invention provides two methods for determining cheating. These two methods are relatively common in fuel dispenser cheating, and the inspection operation is simple and the inspection results are accurate.

[0049] The tester's chip is sealed with epoxy resin, and the housing is welded. It also features a self-destruct function that automatically destroys the device upon opening, formatting and deleting the internal program. This prevents disassembly of the tester and its internal chip and program from being copied or counterfeited. Furthermore, the tester's explosion-proof design meets the safety requirements for use within gas stations.

[0050] The present invention also provides a specific example to illustrate the specific implementation process of the above-mentioned fuel dispenser cheating detection method and device. Figure 4 FIG. 4 is a schematic diagram of an operation panel of a tester according to a specific example of the present invention. Figure 5 4 is a flow chart of a method for detecting cheating in a fuel dispenser according to a specific example of the present invention.

[0051] S1. According to the verification procedures of JJG 443-2023 "Fuel Dispenser (Trial)", use a dedicated handheld terminal for fuel dispenser verification (hereinafter referred to as the handheld terminal) to query and verify the activation status of the fuel dispenser's self-locking function, the monitoring microprocessor serial number, the encoder serial number, the indicator device serial number, abnormal fueling records and other information, and conduct a preliminary inspection of the fuel dispenser.

[0052] S2: Power off the fuel dispenser. Unplug the connector between the fuel dispenser encoder and the control board. Connect the first connector to the encoder and the second connector to the control board. Connect the encoder, tester, and control board in series.

[0053] S3: Power on the fuel dispenser. Select the "63 Lock" button. The tester identifies the serial number pairing between the monitoring microprocessor sent by the encoder and the serial number associated with the encoder. Based on the monitoring microprocessor serial number in this pairing, it generates a new monitoring microprocessor serial number, creating a new serial number pairing. This is then sent to the encoder. After three refueling operations are performed on the fuel dispenser, refueling should resume. A fuel dispenser with a functioning self-locking system should lock and prevent refueling, displaying the message "63." If the fuel dispenser does not lock, according to JJG 443-2023 "Fuel Dispenser (Trial)" Verification Procedure 6.3.5: "After the self-locking function is activated, the self-locking function should not automatically activate after the monitoring microprocessor is replaced. If the self-locking function is not reactivated, after three refueling operations, the encoder should stop sending signals to the monitoring microprocessor, and the fuel dispenser should lock and prevent refueling." This indicates that the fuel dispenser's self-locking function does not meet regulatory requirements and is unqualified, indicating suspicion of fraud.

[0054] Since each fuel dispenser serial number is verified by a special algorithm and key and must be kept confidential, this specific example will assume a false serial number and its verification process is as follows:

[0055] Assume that in the standard serial number, the fuel dispenser manufacturer code is M 标准 =001, fuel dispenser model code T 标准 =05, fuel dispenser serial number code N 标准 =1001, random code R 标准 =7A3DS.

[0056] Furthermore, it is assumed that f(001)=9A2, g(05)=12, h(1001)=3003, and k(7A3D)=D4F1.

[0057] Therefore, the fake serial number should be 9A2123003D4F1.

[0058] In addition, in the CRC check, false serial number S must be excluded 虚假 Random code R in 虚假=D4F1 to ensure the accuracy of CRC check and the format integrity of the false serial number.

[0059] S4. For the fuel dispenser with "63" lock, select the "Cancel 63 lock" button, and the tester sends the serial number pairing relationship bound between the original monitoring microprocessor and the encoder to the encoder.

[0060] S5, use the handheld terminal to restart the self-locking function of the fuel dispenser. Its purpose is: ⑴ Reconfirm the serial number pairing relationship between the original monitoring microprocessor and the encoder, ⑵ Unlock the fuel dispenser that was locked during the S3 operation (if the machine is locked during the S3 operation).

[0061] S6, select the "64 Lock Machine N" button in sequence (N is a number: 1 to 5, representing adding 10%, 20%, 30%, 40%, and 50% pulse signals respectively), and operate the fuel dispenser to refuel five times.

[0062] S7, use the handheld terminal to check whether there are any new abnormal refueling records in the refueling machine. A normal refueling machine should store five abnormal refueling records. Otherwise, the refueling machine does not meet the requirements of the regulations, is unqualified, and has cheated.

[0063] S8, pick up the gun to refuel again. A normal gas station should be locked and unable to refuel, and prompt "64". Otherwise, the gas station does not meet the requirements of the regulations, is unqualified, and has cheated.

[0064] In summary, according to the above embodiments of the present invention, (1) a false serial number is intentionally generated and sent to the encoder. After the gas station performs a specific number of refueling (usually three times), if the gas station does not lock the machine, the self-locking function of the gas station does not meet the requirements of the regulations and there is cheating. (2) According to the standard pulse signal sent by the encoder, a new pulse signal is generated according to the set ratio and sent to the metering and control mainboard of the gas station to simulate metering cheating; and when the gas station performs a specific number of simulated metering cheating (usually five times) to refuel but still does not lock the machine, it is determined that the gas station has cheated. (3) When the gas station performs a specific simulated metering cheating to refuel but there is no corresponding abnormal refueling record, it is determined that the gas station has cheated. The present invention uses a deliberately generated false serial number to test whether the self-locking function of the gas station has been broken, or simulates metering cheating to confirm whether the gas station determines, records abnormal records, and locks the machine, so that cheating behavior of the gas station can be checked quickly, effectively, and conveniently.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for checking cheating at a fuel dispenser, characterized in that: include: Receive the serial number pairing relationship between the fuel dispenser's encoder and the monitoring microprocessor; generating a false serial number different from a standard serial number of the monitoring microprocessor according to the serial number matching relationship and sending the false serial number to the encoder; If the fuel dispenser performs a specific number of fueling operations for simulating metering cheating but still does not lock the dispenser, it is determined that cheating occurs in the fuel dispenser.

2. The method according to claim 1, characterized in that After the fuel dispenser is locked, the method further includes: sending the standard serial number to the encoder to unlock the fuel dispenser.

3. The method according to claim 1, characterized in that After sending the false sequence number to the encoder, the method further comprises: According to the standard pulse signal sent by the encoder, a new pulse signal is generated according to a set ratio and sent to the metering control mainboard of the fuel dispenser to simulate metering cheating; and If the fuel dispenser performs a specific number of fueling operations for simulating metering cheating but still does not lock the dispenser, it is determined that cheating occurs in the fuel dispenser.

4. The method according to claim 3, characterized in that After sending the new pulse signal to the metering and control main board, the method further includes: determining that the gas station has cheated when the gas station performs a specific number of refueling operations for simulating metering cheating but there is no corresponding abnormal refueling record.

5. The method according to any one of claims 1 to 4, characterized in that The total number of digits of the false serial number is the same as that of the standard serial number, and both contain the same fuel dispenser manufacturer code, fuel dispenser model code, fuel dispenser serial number code and random code.

6. The method according to claim 5, characterized in that The false serial number S 虚假 The generation method is: S 虚假 =f(M 标准 )·g(T 标准 )·h(N 标准 )·k(R 标准 ) in: M is the manufacturer code of the fuel dispenser, T is the model code of the fuel dispenser, N is the serial number code of the fuel dispenser, and R is a random code; K is the preset key, Represents the exclusive OR operation; g(T 标准 )=(T 标准 +Δ T )mod10L T , ΔT is the fixed offset, L T The number of digits encoding the fuel dispenser model; h(N 标准 )=(N 标准 ×P)mod10L N , P is a prime number, L N The number of digits encoding the fuel dispenser serial number; k(R 标准 )=H(R 标准 ||Salt), H is the hash function and Salt is the random salt value.

7. The method according to claim 6, characterized in that The check code C of the false serial number and the standard serial number satisfies: C 虚假 =CRC(S 虚假 \R 虚假 ) Wherein CRC is a cyclic redundancy check algorithm to ensure the format integrity of the false serial number; Backslash means in check code C 虚假 When calculating the false serial number S, it is necessary to exclude 虚假 Random code R in 虚假 .

8. A fuel dispenser cheating detection device, used to apply the fuel dispenser cheating detection method according to any one of claims 1 to 7, characterized in that: include: a first connector, for connecting to an encoder of a fuel dispenser, for receiving from the encoder a serial number pairing relationship between the encoder and a monitoring microprocessor; a tester connected to the first connector, configured to generate a false serial number different from a standard serial number of the monitoring microprocessor based on the serial number matching relationship; and The first connector is further used to send the false serial number to the encoder; The tester is further used to determine that cheating exists in the fuel dispenser when the fuel dispenser performs a specific number of fueling operations for simulating metering cheating but the dispenser is still not locked.

9. The device according to claim 8, characterized in that The first connector also transmits the standard serial number to the encoder to unlock the fuel dispenser.

10. The device according to claim 8, characterized in that Also includes: A second connector is used to connect to the metering and control mainboard of the fuel dispenser; The first connector is also used to receive the standard pulse signal sent by the encoder; The tester is further configured to generate a new pulse signal according to a set ratio based on the standard pulse signal and send it to the control mainboard via the second connector; The tester is further used to determine that cheating exists in the fuel dispenser when the fuel dispenser performs a specific number of fueling operations for simulating metering cheating but the dispenser is still not locked.

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